Roller Block: Pushrods Rubbing Against Head

so smaller base circle than stock and stock rockers and lifters
so stock pushrods are too short
get the right pushrods then you may not have to grind (or you might with the larger springs but still get the pushrods right)
come to think of it rocker and retainer are going to be in same place when closed no matter what pushrod- still get the pushrods right because
check your lifters
are they "topped out" no clearance
that's bad
check the pushrod seat against the wire or snap ring needs to be down say .040
you might want to pm Slantsix64 Or read his thread 318 budget build
he found a shelf pushrod that worked with his cam reground to MP RT specs
what's your grind